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(No Model'.) 2 Sheets-Sheet 2;

J.B.D OBSON. BOLTING REEL.

No. 429,339. Patented June a, 1890.

JLZ Z WYZAESSES.

UNITED STATES PATENT OFFIC JAMES B. DOBSON, OF INDIANAPOLIS, INDIANA.

BOLTlNG-REEL.

SPECIFICATION forming part of Letters Patent No. 429,339, dated J une3, 1890.

Application filed April 30, 1888, Serial No. 272,298. (No model.)

To all whom it may concern:

Be it known that I, JAMES B. DoBsoN, a subject of the Queen of Great Britain, residing at West Indianapolis, in the county of Marionand State of Indiana, have invented certain new andusefulImprovements in Bolting-Reels, of which the following is a specification.

As is well known to those skilled in the art, in the modern system of milling it is common to pass the material successively through several grinding-mills and to interpose between each grinding-mill and the one succeeding it a bolting-reel or scalper, which shall separate from the mass of material that portion which has been sufficiently ground, the remaining portion of the material passing on to the next grinding-milL'and so on, until the grinding is completed. Each step in the process of grinding is commonly denominated by millers a break, and this term will be hereinafter employed.

It has been common to use a separate bolting-reel for each mill of the series; and my object is to reduce the expense by embodying in a single machine two or more bolts or scalpers, the number corresponding to the number of grinding-mills used in the system, and I have illustrated a machine embodying four of these bolts or sieves, such as would be employed in a four-break system, where four grinding-mills are employed.

My present object is accomplished by mounting in a single revolving frame-work (similar to the frame-work of an ordinary bolting-reel) two or more cylindrical sieves or bolts, each of which communicates at each end with'a compartment separate from the others. The compartments at one end are arranged to receive the material which, comes from the grinding-mills, and those at the other end serve as conduits through which the coarser or unbolted portion of the material will be conveyed away to the succeeding mill of the series. That portion of the material which is bolted in passing through the sieves falls down into a common receptacle below, whence it is carried by a conveyor, as is usual with ordinary bolting-reels.

Referring to the accompanying drawings, which are made a part hereof, and on which than the section of the interior, thus also showing a portion of the interior in elevation; Fig. 2, an end elevation showing the arrangement of the mechanism at the right-hand end of the machine, as shown in Fig. 1; Fig. 3, a similar view to a portion of the left-hand end of Fig. l, but on an enlarged scale; Fig. 4, a transverse sectional view looking. toward the left from the dotted line 4 4 in Fig. 1; Fig. 5, a transverse sectional View through the circular rack by which the shafts carrying the brushes are driven, looking outwardly toward the cross-bar of the frame-work from the dotted line 5 5 in Fig. 6, to which said rack is secured; and Fig. 6, a view, similar to Fig. 3, of the right-hand end of the machine, on an enlarged scale, showing the gearing and how the bolts and brushes are enabled to be removed from the machine.

In said drawings, the portions marked A represent the stationary frame-work and outside casing of the machine; B,the revolving frame-work; O, the shafts carrying the brushes to the bolts; 0', C C and C the small bolts or scalpers mounted in the frame-work B, and constructed and arranged in accordance with my invention; D, a circular rack by which the shafts O, carrying the brushes, are driven, and E ordinary conveyers.

The frame A is similar in appearance and construction to the frame of an ordinary bolting-reel, and carries bearings for the shafts to the revolving frame-work, the conveyers, and other mechanism necessary to the operation of the machine. To it are also attached the troughs or casing for the conveyers, and the ingress and egress spouts for the material, as usual.

The frame-work B occupies the position which is usually occupied by the single bolting-reel used in the ordinary construction. It is mounted on the shaft B, and its central portion is in the form of a box inclosing said shaft. It is provided with four wings I), which extend out from the corners of the box surrounding the shaft .to near the pc- IOC riphery of the structure, and incase the several bolts or sieves partially, separating them from each other, as shown most plainly (two not being shown are indicated in dotted lines) in Fig. at. At each end it is divided into four compartments, as shown in Fig. 1, (at one end in full lines and at the other end in dotted lines,) and each compartment connects with one of the bolts. These compartments are formed by a heavy stationary annular ring B secured rigidly to the frame-work A, and provided with grooves on its interior surface, in which flanges b, forming the sides of the compartments, travel. Spouts leading from the grindin g-mills or from elevators connected therewith lead into these compartments, one from each mill, and thus the product of each mill is treated by a separate sieve or bolt, as will be presently more fully described.

As shown, there are four sieves or bolts 0', C C and C, mounted in suitable hearings in the revolving frame-work B. They are constructed independently of the frame 13, and may be removed therefrom by removing the screws 0, which are shown as securing the heads thereof to the framework in Figs. 2 and 3. They are removed through the openings in the right-hand end, which are slightly larger than those in the left-hand end, and are not obstructed by spiders or other devices, which would prevent this from being done. There may, however, be only two or three, or there may be a greater number, without departing from my invention. Each one of these sieves or bolts is provided with a central shaft 0, which revolves therein and carries brushes, as shown, for agitating the material passing through said bolts. These shafts are provided upon one end with small pinions, (see Fig. 2,) which engage with the circular rack-bar D, whereby as the frame 13 revolves said shafts are thus also revolved, and the brushes thereby moved over the interior surface of the bolts. Upon the other end of said shafts, within the compartments into which the material is first received from the grinding-mills, are small conveyor-sections 0, (preferably formed, as shown, like pr01:)eller-whecls,) by which the material is forced from said compartments into the bolts, and along the body of said shafts, inside the bolts, are secured the frames carrying the brushes. As will be noticed by an examination of the drawings, each one of these bolts is made to extend into the particular compartment connected therewith and nofarther, and the remainder of the opening, extending through the revolving frame B, which would otherwise be occupied by the end of the bolt, is filled with an imperforate tube or cylinder C, and thus any material which might otherwise get into said space is prevented from entering therein. The otherends of these small bolts or sieves (which run to the compartments indicated by the dotted lines in Fig. 1) are similarly formed, except that there is no conveyer-section in connection therewith, and the coarse material which passes entirely through without being bolted is thus discharged (as well as received) separately, after which it is ready to be conveyed to the grinding-mill, .which is arranged to make the next break in the process of grinding. The bolted material from the several bolts as the frame work I revolves falls from the wings I) into a common receptacle at the bottom of the structure, and is carried away by the conveyors E, in the ordinary manner.

The circular rack D is fixedly secured to the frame-work A and surrounds the shaft 13 of the revolving framework B, and is so arranged that the small pinions on the ends of the shafts C shall engage therewith, and said shafts be thus revolved as the frame 1: re volves, although at a considerably greater speed.

I will now proceed to describe the operation of my invention where four bolts are employed, as shown in the accompanying drawings. The material is first brought from what, for the sake of convenience, will be called mill No. 1 and conducted into the receiving-compartment connected with the bolt C and subjected to its treatment, whereby that portion of the material which has been ground fine enough is bolted off, and drops down upon the conveyors, by which it is conveyed away, but the large portion which has not yet been reduced sufficiently is discharged from the other end of the bolt to the proper discharging compartment and is spouted olf to mill No. 2. The material from mill N o. 2 is brought to and discharged into the receiving compartment connected with the bolt 0 and similarly treated, the remaining portion being similarly carried to mill No. 3. The material from mill No. 3 is similarly conducted to the bolt G and what is left after this bolting is conveyed to mill No. 4, which, when the apparatus illustrated is used, is the final one of the series, and after being subjected to the operation of this mill is conveyed to the bolt G which bolts out all the remaining time flour, what is left after this operation being only bran, which is conveyed away as usual.

I do not claim in this application a series of bolts in a single machine broadly, but claim them in combination with separate compartments communicating therewith, for receiving and discharging the material to be treated.

Having thus fully described my said invention, what I claim as new, and desire to se cure by Letters Patent, is-

1. In a bolting-reel, two or more separate belts or sieves arranged alongside each other and mounted in the same rotary structure, and separate feed and discharge compartments communicating therewith, through which the material to be treated is received and discharged therefrom.

2. The combination, in a bolting-reel, of a revolving frame-work having two or more compartments at each end, separate bolts or sieves mounted in said frame-work, each connecting with one of each of said sets of compartments, the means described for revolving said frame-work, shafts extending through said bolts carrying suitable agitating devices, and means for revolving said shafts.

3. In a bolting-reel, a revolving frame-work provided with rests or bearings for separate bolts or sieves, said bearings being tubular in form and extending to the ends of the structure, whereby the bolts may be removed therefrom from said ends Without disturbing the structure as a whole, substantially as set forth.

4. The combination,in abolting-reel, of several bolts or sieves, shafts extending through the same, which revolve independently thereof, carrying suitable agitating devices; which shafts are provided with pinions, and a cir- 5. The combination of a bolt or sieve extending into a compartment, said compartmeni, a shaft carrying brushes or other suitable parts revolving inside of said bolt, and a short conveyer-section mounted on said shaft within the space where the compartment and the bolt communicate, whereby the material is forced from said compartment into said bolt or sieve, substantially as set forth. In witness whereof I have hereunto set my hand and seal, at Indianapolis, Indiana, this 25th day of April A. D. 1888. JAMES B. DOBSON. [L. s.]

Witnesses:

O. BRADFORD, A. N. DWYER. 

